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Mitsubishi BD28 - 11AK19

 
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Padraig



Joined: 04 Jan 2007
Posts: 2

PostPosted: Sat Jan 06, 2007 8:53 pm    Post subject: Mitsubishi BD28 - 11AK19 Reply with quote

Think this is a 11AK19PRO chassis.

During recent PSU repair replaced Q802(s/c), D826(s/c), D827(s/c),
R825(o/c), IC802(as percaution) and also D807(PCB scorched even though this
diode ok). Set appears to work fine, but fails again after a few days -
will not come out of standby. D807 (BA159) found s/c both times. Any hints
why D807 keeps failing? Is s/c more likely from overcurrent or overvoltage
spike?

Great Site - would not have had TV for Christmas without it
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Frank
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PostPosted: Sun Jan 07, 2007 12:05 am    Post subject: Reply with quote

My idea is that you forgot to check the caps, those are mostly like the cause of most faults, ESR is important because they may check good capacitance but they dry.
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Padraig



Joined: 04 Jan 2007
Posts: 2

PostPosted: Mon Jan 08, 2007 12:29 am    Post subject: Reply with quote

Frank,
Thanks for the reply.
I don't really have any way to check capacitors. I'll just wait 'till another failure and either replace all PSU caps, leave to a repair shop, or replace the set. I haven't repaired anything electronic for about 15 years. Still fun.
Thanks again.
Padraig
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